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1 /* ocsp_cl.c */
2 /* Written by Tom Titchener <Tom_Titchener@groove.net> for the OpenSSL
3  * project. */
4 
5 /* History:
6    This file was transfered to Richard Levitte from CertCo by Kathy
7    Weinhold in mid-spring 2000 to be included in OpenSSL or released
8    as a patch kit. */
9 
10 /* ====================================================================
11  * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  *
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  *
20  * 2. Redistributions in binary form must reproduce the above copyright
21  *    notice, this list of conditions and the following disclaimer in
22  *    the documentation and/or other materials provided with the
23  *    distribution.
24  *
25  * 3. All advertising materials mentioning features or use of this
26  *    software must display the following acknowledgment:
27  *    "This product includes software developed by the OpenSSL Project
28  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
29  *
30  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
31  *    endorse or promote products derived from this software without
32  *    prior written permission. For written permission, please contact
33  *    openssl-core@openssl.org.
34  *
35  * 5. Products derived from this software may not be called "OpenSSL"
36  *    nor may "OpenSSL" appear in their names without prior written
37  *    permission of the OpenSSL Project.
38  *
39  * 6. Redistributions of any form whatsoever must retain the following
40  *    acknowledgment:
41  *    "This product includes software developed by the OpenSSL Project
42  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
43  *
44  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
45  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
47  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
48  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
49  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
50  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
51  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
53  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
54  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
55  * OF THE POSSIBILITY OF SUCH DAMAGE.
56  * ====================================================================
57  *
58  * This product includes cryptographic software written by Eric Young
59  * (eay@cryptsoft.com).  This product includes software written by Tim
60  * Hudson (tjh@cryptsoft.com).
61  *
62  */
63 
64 #include <stdio.h>
65 #include <time.h>
66 #include <cryptlib.h>
67 #include <openssl/objects.h>
68 #include <openssl/rand.h>
69 #include <openssl/x509.h>
70 #include <openssl/pem.h>
71 #include <openssl/x509v3.h>
72 #include <openssl/ocsp.h>
73 
74 /* Utility functions related to sending OCSP requests and extracting
75  * relevant information from the response.
76  */
77 
78 /* Add an OCSP_CERTID to an OCSP request. Return new OCSP_ONEREQ
79  * pointer: useful if we want to add extensions.
80  */
81 
OCSP_request_add0_id(OCSP_REQUEST * req,OCSP_CERTID * cid)82 OCSP_ONEREQ *OCSP_request_add0_id(OCSP_REQUEST *req, OCSP_CERTID *cid)
83         {
84 	OCSP_ONEREQ *one = NULL;
85 
86 	if (!(one = OCSP_ONEREQ_new())) goto err;
87 	if (one->reqCert) OCSP_CERTID_free(one->reqCert);
88 	one->reqCert = cid;
89 	if (req &&
90 		!sk_OCSP_ONEREQ_push(req->tbsRequest->requestList, one))
91 				goto err;
92 	return one;
93 err:
94 	OCSP_ONEREQ_free(one);
95 	return NULL;
96         }
97 
98 /* Set requestorName from an X509_NAME structure */
99 
OCSP_request_set1_name(OCSP_REQUEST * req,X509_NAME * nm)100 int OCSP_request_set1_name(OCSP_REQUEST *req, X509_NAME *nm)
101 	{
102 	GENERAL_NAME *gen;
103 	gen = GENERAL_NAME_new();
104 	if (gen == NULL)
105 		return 0;
106 	if (!X509_NAME_set(&gen->d.directoryName, nm))
107 		{
108 		GENERAL_NAME_free(gen);
109 		return 0;
110 		}
111 	gen->type = GEN_DIRNAME;
112 	if (req->tbsRequest->requestorName)
113 		GENERAL_NAME_free(req->tbsRequest->requestorName);
114 	req->tbsRequest->requestorName = gen;
115 	return 1;
116 	}
117 
118 
119 /* Add a certificate to an OCSP request */
120 
OCSP_request_add1_cert(OCSP_REQUEST * req,X509 * cert)121 int OCSP_request_add1_cert(OCSP_REQUEST *req, X509 *cert)
122 	{
123 	OCSP_SIGNATURE *sig;
124 	if (!req->optionalSignature)
125 		req->optionalSignature = OCSP_SIGNATURE_new();
126 	sig = req->optionalSignature;
127 	if (!sig) return 0;
128 	if (!cert) return 1;
129 	if (!sig->certs && !(sig->certs = sk_X509_new_null()))
130 		return 0;
131 
132 	if(!sk_X509_push(sig->certs, cert)) return 0;
133 	CRYPTO_add(&cert->references, 1, CRYPTO_LOCK_X509);
134 	return 1;
135 	}
136 
137 /* Sign an OCSP request set the requestorName to the subjec
138  * name of an optional signers certificate and include one
139  * or more optional certificates in the request. Behaves
140  * like PKCS7_sign().
141  */
142 
OCSP_request_sign(OCSP_REQUEST * req,X509 * signer,EVP_PKEY * key,const EVP_MD * dgst,STACK_OF (X509)* certs,unsigned long flags)143 int OCSP_request_sign(OCSP_REQUEST   *req,
144 		      X509           *signer,
145 		      EVP_PKEY       *key,
146 		      const EVP_MD   *dgst,
147 		      STACK_OF(X509) *certs,
148 		      unsigned long flags)
149         {
150 	int i;
151 	OCSP_SIGNATURE *sig;
152 	X509 *x;
153 
154 	if (!OCSP_request_set1_name(req, X509_get_subject_name(signer)))
155 			goto err;
156 
157 	if (!(req->optionalSignature = sig = OCSP_SIGNATURE_new())) goto err;
158 	if (key)
159 		{
160 		if (!X509_check_private_key(signer, key))
161 			{
162 			OCSPerr(OCSP_F_OCSP_REQUEST_SIGN, OCSP_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
163 			goto err;
164 			}
165 		if (!OCSP_REQUEST_sign(req, key, dgst)) goto err;
166 		}
167 
168 	if (!(flags & OCSP_NOCERTS))
169 		{
170 		if(!OCSP_request_add1_cert(req, signer)) goto err;
171 		for (i = 0; i < sk_X509_num(certs); i++)
172 			{
173 			x = sk_X509_value(certs, i);
174 			if (!OCSP_request_add1_cert(req, x)) goto err;
175 			}
176 		}
177 
178 	return 1;
179 err:
180 	OCSP_SIGNATURE_free(req->optionalSignature);
181 	req->optionalSignature = NULL;
182 	return 0;
183 	}
184 
185 /* Get response status */
186 
OCSP_response_status(OCSP_RESPONSE * resp)187 int OCSP_response_status(OCSP_RESPONSE *resp)
188 	{
189 	return ASN1_ENUMERATED_get(resp->responseStatus);
190 	}
191 
192 /* Extract basic response from OCSP_RESPONSE or NULL if
193  * no basic response present.
194  */
195 
196 
OCSP_response_get1_basic(OCSP_RESPONSE * resp)197 OCSP_BASICRESP *OCSP_response_get1_basic(OCSP_RESPONSE *resp)
198 	{
199 	OCSP_RESPBYTES *rb;
200 	rb = resp->responseBytes;
201 	if (!rb)
202 		{
203 		OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NO_RESPONSE_DATA);
204 		return NULL;
205 		}
206 	if (OBJ_obj2nid(rb->responseType) != NID_id_pkix_OCSP_basic)
207 		{
208 		OCSPerr(OCSP_F_OCSP_RESPONSE_GET1_BASIC, OCSP_R_NOT_BASIC_RESPONSE);
209 		return NULL;
210 		}
211 
212 	return ASN1_item_unpack(rb->response, ASN1_ITEM_rptr(OCSP_BASICRESP));
213 	}
214 
215 /* Return number of OCSP_SINGLERESP reponses present in
216  * a basic response.
217  */
218 
OCSP_resp_count(OCSP_BASICRESP * bs)219 int OCSP_resp_count(OCSP_BASICRESP *bs)
220 	{
221 	if (!bs) return -1;
222 	return sk_OCSP_SINGLERESP_num(bs->tbsResponseData->responses);
223 	}
224 
225 /* Extract an OCSP_SINGLERESP response with a given index */
226 
OCSP_resp_get0(OCSP_BASICRESP * bs,int idx)227 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx)
228 	{
229 	if (!bs) return NULL;
230 	return sk_OCSP_SINGLERESP_value(bs->tbsResponseData->responses, idx);
231 	}
232 
233 /* Look single response matching a given certificate ID */
234 
OCSP_resp_find(OCSP_BASICRESP * bs,OCSP_CERTID * id,int last)235 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last)
236 	{
237 	int i;
238 	STACK_OF(OCSP_SINGLERESP) *sresp;
239 	OCSP_SINGLERESP *single;
240 	if (!bs) return -1;
241 	if (last < 0) last = 0;
242 	else last++;
243 	sresp = bs->tbsResponseData->responses;
244 	for (i = last; i < sk_OCSP_SINGLERESP_num(sresp); i++)
245 		{
246 		single = sk_OCSP_SINGLERESP_value(sresp, i);
247 		if (!OCSP_id_cmp(id, single->certId)) return i;
248 		}
249 	return -1;
250 	}
251 
252 /* Extract status information from an OCSP_SINGLERESP structure.
253  * Note: the revtime and reason values are only set if the
254  * certificate status is revoked. Returns numerical value of
255  * status.
256  */
257 
OCSP_single_get0_status(OCSP_SINGLERESP * single,int * reason,ASN1_GENERALIZEDTIME ** revtime,ASN1_GENERALIZEDTIME ** thisupd,ASN1_GENERALIZEDTIME ** nextupd)258 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
259 				ASN1_GENERALIZEDTIME **revtime,
260 				ASN1_GENERALIZEDTIME **thisupd,
261 				ASN1_GENERALIZEDTIME **nextupd)
262 	{
263 	int ret;
264 	OCSP_CERTSTATUS *cst;
265 	if(!single) return -1;
266 	cst = single->certStatus;
267 	ret = cst->type;
268 	if (ret == V_OCSP_CERTSTATUS_REVOKED)
269 		{
270 		OCSP_REVOKEDINFO *rev = cst->value.revoked;
271 		if (revtime) *revtime = rev->revocationTime;
272 		if (reason)
273 			{
274 			if(rev->revocationReason)
275 				*reason = ASN1_ENUMERATED_get(rev->revocationReason);
276 			else *reason = -1;
277 			}
278 		}
279 	if(thisupd) *thisupd = single->thisUpdate;
280 	if(nextupd) *nextupd = single->nextUpdate;
281 	return ret;
282 	}
283 
284 /* This function combines the previous ones: look up a certificate ID and
285  * if found extract status information. Return 0 is successful.
286  */
287 
OCSP_resp_find_status(OCSP_BASICRESP * bs,OCSP_CERTID * id,int * status,int * reason,ASN1_GENERALIZEDTIME ** revtime,ASN1_GENERALIZEDTIME ** thisupd,ASN1_GENERALIZEDTIME ** nextupd)288 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
289 				int *reason,
290 				ASN1_GENERALIZEDTIME **revtime,
291 				ASN1_GENERALIZEDTIME **thisupd,
292 				ASN1_GENERALIZEDTIME **nextupd)
293 	{
294 	int i;
295 	OCSP_SINGLERESP *single;
296 	i = OCSP_resp_find(bs, id, -1);
297 	/* Maybe check for multiple responses and give an error? */
298 	if(i < 0) return 0;
299 	single = OCSP_resp_get0(bs, i);
300 	i = OCSP_single_get0_status(single, reason, revtime, thisupd, nextupd);
301 	if(status) *status = i;
302 	return 1;
303 	}
304 
305 /* Check validity of thisUpdate and nextUpdate fields. It is possible that the request will
306  * take a few seconds to process and/or the time wont be totally accurate. Therefore to avoid
307  * rejecting otherwise valid time we allow the times to be within 'nsec' of the current time.
308  * Also to avoid accepting very old responses without a nextUpdate field an optional maxage
309  * parameter specifies the maximum age the thisUpdate field can be.
310  */
311 
OCSP_check_validity(ASN1_GENERALIZEDTIME * thisupd,ASN1_GENERALIZEDTIME * nextupd,long nsec,long maxsec)312 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *nextupd, long nsec, long maxsec)
313 	{
314 	int ret = 1;
315 	time_t t_now, t_tmp;
316 	time(&t_now);
317 	/* Check thisUpdate is valid and not more than nsec in the future */
318 	if (!ASN1_GENERALIZEDTIME_check(thisupd))
319 		{
320 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_THISUPDATE_FIELD);
321 		ret = 0;
322 		}
323 	else
324 		{
325 			t_tmp = t_now + nsec;
326 			if (X509_cmp_time(thisupd, &t_tmp) > 0)
327 			{
328 			OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_NOT_YET_VALID);
329 			ret = 0;
330 			}
331 
332 		/* If maxsec specified check thisUpdate is not more than maxsec in the past */
333 		if (maxsec >= 0)
334 			{
335 			t_tmp = t_now - maxsec;
336 			if (X509_cmp_time(thisupd, &t_tmp) < 0)
337 				{
338 				OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_TOO_OLD);
339 				ret = 0;
340 				}
341 			}
342 		}
343 
344 
345 	if (!nextupd) return ret;
346 
347 	/* Check nextUpdate is valid and not more than nsec in the past */
348 	if (!ASN1_GENERALIZEDTIME_check(nextupd))
349 		{
350 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_ERROR_IN_NEXTUPDATE_FIELD);
351 		ret = 0;
352 		}
353 	else
354 		{
355 		t_tmp = t_now - nsec;
356 		if (X509_cmp_time(nextupd, &t_tmp) < 0)
357 			{
358 			OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_STATUS_EXPIRED);
359 			ret = 0;
360 			}
361 		}
362 
363 	/* Also don't allow nextUpdate to precede thisUpdate */
364 	if (ASN1_STRING_cmp(nextupd, thisupd) < 0)
365 		{
366 		OCSPerr(OCSP_F_OCSP_CHECK_VALIDITY, OCSP_R_NEXTUPDATE_BEFORE_THISUPDATE);
367 		ret = 0;
368 		}
369 
370 	return ret;
371 	}
372